Compared to the rest of the San Diego market, the Spring Valley submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 3 listings have been listed, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,190 sqft.